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<DIV><FONT size=2 face=Arial>I used to use phenolic races in my nearing.
Would normally avoid it destroying my engine when it did let go. The
engine would quit immediately, but without the metal race tearing up the inside
of the engine it was usually an easy repair.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Paul</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=verne@twmi.rr.com href="mailto:verne@twmi.rr.com">Verne Koester</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">'General pattern
discussion'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, May 23, 2009 12:22
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] The good,
the bad, and the ugly</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Mike,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">How
old was the bearing? They’ll all self-destruct eventually. If you pull on the
prop blades and feel ANY roughness while you’re rotating the prop back and
forth, it’s time. When I used to run YS, one season was about the best I could
hope for on a main bearing. If I made it all the way through without it
failing the roughness test, I’d replace it over the winter just to avoid
having it go at an inopportune time the following
season.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Verne<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <B>On Behalf Of </B>Michael
Cohen<BR><B>Sent:</B> Friday, May 22, 2009 7:46 PM<BR><B>To:</B>
nsrca-discussion@lists.nsrca.org<BR><B>Subject:</B> Re: [NSRCA-discussion] The
good, the bad, and the ugly<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; FONT-SIZE: 10pt">For those of you
on the edge of your seat waiting to hear what was the likely cause
..... well....... a neighbor with a gear puller helped me pop of the
thrust washer and after removing the crank shaft, I found the main
bearing had eaten itself. The race had come apart and the
balls we free to slap around. The bearing probably went first
allowing the crank to wobble taking on the connecting rod. Bob
Kane has come to my rescue with pieces of Mark Atwood's old and damaged
160DZ. I will attempt to make one running engine out of
two.<BR> <BR>I have not heard of bearing failures with YS engines.
I is there some preventative maintenance I could have done to keep this from
happening? Did I make some mistake that leads to this kind of
failure? Is it just one of those things that is bound to happen one
of these days?<BR> <o:p></o:p></SPAN></P>
<DIV style="TEXT-ALIGN: center" class=MsoNormal align=center><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; FONT-SIZE: 10pt">
<HR id=stopSpelling align=center SIZE=2 width="100%">
</SPAN></DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; FONT-SIZE: 10pt">From:
precisionaero@hotmail.com<BR>To: nsrca-discussion@lists.nsrca.org<BR>Date:
Thu, 21 May 2009 04:58:52 -0600<BR>Subject: Re: [NSRCA-discussion] The good,
the bad, and the ugly<BR><BR>Low viscosity PowerMaster DZ blend, 30%
nitro, 20% synthetic is the fuel. I had replaced the ring a few months
ago, so I had taken apart most of the engine and re-assembled
it using Klotz so it would not be dry the first time fuel ran
through it. By the way, I was 1.75 turn out on the main needle.
That seemed to be the RPM sweet spot +1/8 turn rich for good luck.
The pump was just right, the engine would chug along at 1900 RPM with a 4
blade nicely. I had a nice smoke trail too, almost until the abrupt
stop.<BR> <o:p></o:p></SPAN></P>
<DIV style="TEXT-ALIGN: center" class=MsoNormal align=center><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; FONT-SIZE: 10pt">
<HR id=EC_stopSpelling align=center SIZE=2 width="100%">
</SPAN></DIV>
<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; FONT-SIZE: 10pt">Date: Wed, 20 May
2009 19:08:40 -0700<BR>From: getterflash@yahoo.com<BR>To:
nsrca-discussion@lists.nsrca.org<BR>Subject: Re: [NSRCA-discussion] The good,
the bad, and the ugly<o:p></o:p></SPAN></P>
<DIV>
<P class=MsoNormal>Sorry to hear about your streak of bad luck. What
kind of fuel? Was the engine stored with after run oil? <o:p></o:p></P>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<P class=MsoNormal>Bob Kane<BR>getterflash@yahoo.com <o:p></o:p></P>
<DIV>
<P class=MsoNormal><o:p> </o:p></P></DIV>
<DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<DIV style="TEXT-ALIGN: center" class=MsoNormal align=center><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">
<HR align=center SIZE=1 width="100%">
</SPAN></DIV>
<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"> Michael Cohen
<precisionaero@hotmail.com><BR><B>To:</B>
nsrca-discussion@lists.nsrca.org<BR><B>Sent:</B> Wednesday, May 20, 2009
8:24:18 PM<BR><B>Subject:</B> [NSRCA-discussion] The good, the bad, and the
ugly<BR></SPAN><BR>The Good: I finally got out to fly today and put up
flights 6 and 7 for the season.<BR> <BR>The Bad: To say I practiced
flying the Masters Pattern might not hold up in court. It had looping
segments (of various radii), straight lines (some of very, very short length),
roles (lets talk about mortgage rates instead); in other words, it had all the
basic elements. It also could be argued that I was flying the
Wonkavator, up ways and down ways, sideways and back ways and
slantways......<BR> <BR>The Ugly: 5 minutes into flight #2, the
engine stopped. After a fun crosswind glide, I took the engine apart at
the field to find the crankshaft-piston area very dry with shaving's
everywhere, a mashed and bent (sort of) connecting rod, and a damage to the
rotary valve. I need to take pictures and post them because I have never
seen damage like this. It looks like lubricating oil was unable to get
into the region and the engine just ate itself.<BR> <BR>This was my 160DZ
and is on the heals of breaking the shaft that supports the rocker arms on a
140DZ suddenly a month or so ago. Is there something wrong with the
lubrication system on these motors due to some kind of blockage? Any
suggestions on what to check would be appreciated. The engines all
looked clean and free of and kind of FOD when I took them apart and
re-assembled them this late winter/early fall. Before I go killing my
last 170DZ, I am open to what people think I should look for (beside an OS,
going electric, or gas).<BR> <BR>Mike
Cohen<BR>D4<BR> <o:p></o:p></P>
<DIV style="TEXT-ALIGN: center" class=MsoNormal align=center>
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<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><SPAN
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<DIV style="TEXT-ALIGN: center" class=MsoNormal align=center><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; FONT-SIZE: 10pt">
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<P>
<HR>
<P></P>_______________________________________________<BR>NSRCA-discussion
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